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Unit - 1

This document discusses key concepts relating to solar energy technologies. It defines different types of solar radiation including direct, diffuse, and global radiation. It then explains the solar constant, which is the average amount of solar energy received outside Earth's atmosphere. Finally, it discusses how the tilt of Earth's axis and its revolution around the sun cause seasons and affect the distribution and intensity of solar radiation on Earth's surface throughout the year.

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சுந்தர மூர்த்தி சேப்பிளையார்
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41 views17 pages

Unit - 1

This document discusses key concepts relating to solar energy technologies. It defines different types of solar radiation including direct, diffuse, and global radiation. It then explains the solar constant, which is the average amount of solar energy received outside Earth's atmosphere. Finally, it discusses how the tilt of Earth's axis and its revolution around the sun cause seasons and affect the distribution and intensity of solar radiation on Earth's surface throughout the year.

Uploaded by

சுந்தர மூர்த்தி சேப்பிளையார்
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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SOLAR ENERGY

TECHNOLOGIES

Direct / Beam
Diffuse radiation
Global / Total solar radiation = Direct
+ Diffuse
Ground Reflected radiation

Solar Constant
Extraterrestrial radiation (G0n)
Solar Constant (Gsc)
The amount of energy received from the sun per
unit time, over one unit area perpendicular to the
direction of propagation, at earths mean distance
from sun, outside the atmosphere
1367 W/m2

G0n = Gsc (1 + 0.033 cos (360 * n / 365))


n is the day number

Tilt of the earth causes the movement of


sun of 23.45 degree above and below
Equator

Seasons are caused by the tilt of the


Earth's axis of rotation
Northern hemisphere is tilted toward
the Sun and experiences summer
Six months later, when the Earth is on
the opposite side of the Sun, the
northern hemisphere is tilted away
from the Sun and experiences winter

Tilt, orbital rotation, daily revolution


accounts for the distribution of solar
radiation on earths surface and its
change in day length

Solstice dates on which Earth's axis is most


directly tilted either toward or away from the
Sun (21 June, 21 December)

Equinox days on which day and night are


of equal duration (20 March, 22 September)

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